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Shareholders' Equity - Change in AOCI Components Net of Tax (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at Beginning of Period $ 1,374,507 $ 1,286,832 $ 1,268,200
Other Comprehensive Income (Loss) (74,204) 38,934 19,931
Balance at End of Period 1,611,611 $ 1,374,507 1,286,832
Accounting Standards Update Extensible List   Accounting Standards Update 2016-13  
Cumulative Effect, Period of Adoption, Adjustment      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at Beginning of Period   $ 3,632  
Balance at End of Period     3,632
Unrealized Gains and Losses on Net Investment Securities | Available-for-sale Securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at Beginning of Period 51,495 8,359 (10,447)
Other Comprehensive Income (Loss) Before Reclassifications (81,644) 43,163 22,168
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (2,791) (27) (103)
Other Comprehensive Income (Loss) (84,435) 43,136 18,806
Balance at End of Period (32,940) 51,495 $ 8,359
Accounting Standards Update Extensible List     us-gaap:AccountingStandardsUpdate201904Member
Unrealized Gains and Losses on Net Investment Securities | Available-for-sale Securities | Cumulative Effect, Period of Adoption, Adjustment      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at Beginning of Period     $ (3,259)
Unrealized Gains and Losses on Net Investment Securities | Held-to-maturity Securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at Beginning of Period (423) (715) (4,586)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 477 292 612
Other Comprehensive Income (Loss) 477 292 3,871
Balance at End of Period 54 (423) $ (715)
Accounting Standards Update Extensible List     us-gaap:AccountingStandardsUpdate201904Member
Unrealized Gains and Losses on Net Investment Securities | Held-to-maturity Securities | Cumulative Effect, Period of Adoption, Adjustment      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at Beginning of Period     $ 3,259
Defined Benefit Plans      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at Beginning of Period (43,250) (38,756) (36,010)
Other Comprehensive Income (Loss) Before Reclassifications 7,968 (6,017) (3,709)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 1,786 1,523 963
Other Comprehensive Income (Loss) 9,754 (4,494) (2,746)
Balance at End of Period (33,496) (43,250) (38,756)
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at Beginning of Period 7,822 (31,112) (51,043)
Other Comprehensive Income (Loss) Before Reclassifications (73,676) 37,146 18,459
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (528) 1,788 1,472
Other Comprehensive Income (Loss) (74,204) 38,934 19,931
Balance at End of Period $ (66,382) $ 7,822 $ (31,112)